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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1388b7afae62a43c4d49a611a9a0f9d44223a95bba5d5faad3ac220e9e174e2' 
  AND token = '17rqRGMILvTry13ep/WimjqTO5ExmKhWMfomV//yGBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}