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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb2f8ac65662f545efbcd4df682e28caaa0899192e046cb36e0d92dfa579533b' 
  AND token = 'UWKrrLEhrDlyz4TNEgUUWQIr3OSzCR/AzE6PmUuqZgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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