SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbb1ca081687a384e76e286c6186d449191678a37de74f27dfac3df98d1b5459' 
  AND token = '/eTTGNETzovVvlVguZYIFWofWVBakAvZaOPajUKVo9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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