SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61282581c2759dc18b6393e2edc189c6c45f4f51270de31fcddba364c297ce68' 
  AND token = 'Rxm6JWp9Ti1ThkO2mWLx7zKbonf6lRjnWD2ymUqaUK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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