SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ace86fe5dd2cdc73a52afc36397a422577f6dac74a670e3c53b53083199712bf' 
  AND token = 'AJ6C1TNHT6yZCqq7JO/sVgR+kym8rJvACQX1EoW4pAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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