SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '428d22841151ec060d1125c62a1418a8f08946bbe5776ae56cc8ea13d89f9554' 
  AND token = 'YPKdb+yGzLLL0ItvXaQ5jlmsh9jDFZfBgdSk9ZgROcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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