SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e07a2d226996cf4f08de49214420766809d17d8d4f122c186988572cfbbf0cb6' 
  AND token = 'vPpj/oRznMtHFRhqUO/2+gZ3lDNaOdt4HY0Zx1+vO+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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