SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd696fb987059f635d27cac4142efe39b986f3b4f92e9a4f9685ed4193f1e0b86' 
  AND token = 'uh7Yy6KUA8hg+FWCKRt30jqwf3GB0shisqZKOqZGx/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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