Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27aee4d7661492246bde0b2ee3cdbc90661a638baf0feb65dd4f93fc09267943' 
  AND token = '+yr9bDZtL4y4C2aYrHYoCanEgMvF4tWx2bNhnirV6v8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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