SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd18622b945ed3e7f1733982051690a53e10a1dca67f674892372b98f92f1dd63' 
  AND token = 'rk8atGrlV418I2KAthvML+OnwvP52MJuhXxBiSvLIfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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