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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c5a22b673dff9deeef83fd939f0ba1f3a86d30da8abd9b1ee5a87684c6bae16' 
  AND token = 'ZHuHEDwitUWplOgg17pyhxda6z4qULWi2c0lDYfMw80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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