SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40e33492752950f738bd9f2b045611e6ae174d5634f7e34d941788b07ed51b74' 
  AND token = 'eDPFBNYdRoSClQAI1aK27UvX6p8Lzdyom0hLbGNgj/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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