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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c40d63d84e0eb9e2b5c5c170562503b417dfa84b6eac34e2a57a9b3874836cb' 
  AND token = 'WoDwgtHJ5szqoF5y7pRvbCKhRN0DIRtXtTUaCSNof4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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