SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbf7418af6168477c9cd8de43c0850805e62214033a65168c6ddb0ce3b2e4b9c' 
  AND token = 'tlERXCisnHGFuwT/nxZK7KgXlxO3U2DxstLcKZvRIBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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