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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938c7d0a2f7f1a4815e6c80106e7995b2e94a201d8bb5fd15b647748a0fe1140' 
  AND token = 'iFIO7TG1qs/5xAei/ZkEFom6jO7L79WCVl4kxjbs6NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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