SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53d94c745112b2d788d3fedfb3c35cf7fa590a5da3415bc4327513ee98f131fa' 
  AND token = '8jQZH/xA6f3dRazhD+ZruBxyX/sxZKS+hUoTIGUtzfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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