Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f61569b0ba09110a8c5dd84c2028f32d2104f2df9a771e88a46e5850cd7a97d' 
  AND token = '/myE11zpINUiD2Vvj58C/dbWnyv23VAJmrUHj83r+kU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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