Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f15f538d1494003810fdac3d0c703df82a0e8270b3ec5d99cd403b0e4c58799' 
  AND token = 'xn9Jwo7Ypvsm5J2VkhfrWkig4Yx6hy9lUFze5TX0T14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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