Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ef5ac11a585d62cab11306ee71bbbc465545f355aae539122468ba3c3718dff' 
  AND token = 'k/FKuimM7ipOtmKQZnxAxxC9SNjALswc1CEzbAnRki8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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