Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da0e020c548df204b62c7633ca4f47e2fc20c47df4701e0584bfd657d5f9c43c' 
  AND token = 'mhYJM2K7P0uyXbZcK3jZPQUP0/CIqGVA2CKvATa9+WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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