SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9ccf04936e56c96a21d6245ac15f4ac1f48427695c42ccad56bb4a56ae7fe8e' 
  AND token = 'njUFYVhCfaj0/koXEMPQ+yt6f/LS0TsrtiJO1Q/l32U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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