SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3e05dfc23b46a936e7179995c6a990b42a96f45c9d889b1b59b5c07110ded22' 
  AND token = 'WGd938pzVLT9LCbKmlWjSdhmtGkUvdpWETlzh6Opo5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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