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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2039fa6d0572d9933bd51b9e225ddcf6a0bb3bcd1692f39db34c82a76f124fe5' 
  AND token = 'rUTRY+WfiUhzjOOP4krz6VJwrfjp10aRRjLckBwVrTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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