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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '101829eadf618de574d04a087145ff5cde517e8a23a06cb5003230581f76f381' 
  AND token = 'VBQaGGTiX0mXD3pfe+TNCZqA1Jxe7DIafjoeWuvzKQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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