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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90b216275810a32f350d3cad6d59aa6350be5607c0f01b5893ff3068565b2a7c' 
  AND token = 'PYLHFVZ0shxhZTwC+p1ZapUFWnxTM3ZxMgRoKXmucDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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