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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2770e8d14577a95142fde03bec4035da8d7e6ab26fb18ed60e99b7238dc3db2e' 
  AND token = '/mqBj4/gkd2ifSTi0a6GMo2PFJY6oQ0YJbz3eL8wcsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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