SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f313a95a5aadfd015537f108bfd9f33de24657b0c7891b306d260e2da9185c40' 
  AND token = 'wjqx8JrxVpqXkco99OY8AuohodCD/ohZH0mGBmo+G+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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