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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2e145c79a355e9038e5ddb14ee587ebc202bec1f45ebb608fa59a2e6284f38a' 
  AND token = 'xHIfoYDrRMp0yjJb6Xxt1ypBY2fxeKo9IKUTYaEruAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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