SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09ab751cffbcf4bd530910af13562348b3489e62eca12527bbca51469d17a4ce' 
  AND token = 'i1Ybm6FJsZIj4RxNHc5vIIGJCO9R4VwRszdXXh8m+ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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