SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '315ab1fc594bd57d358768d43c65e72bab1bee20a885682f4419eaec2377d514' 
  AND token = 'v0G4c/FjBKpBkLc43q36mpBZKgJYAHIZ9PaaOvu2/F8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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