SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f09fd9b6ee7c956ef8f24146a2c84c581fc4f712c9ea73d12f83b00d57d41b9c' 
  AND token = '06gDRYLPb60XlulsHYVGmeewSMqnjhgdnGm45U6+I+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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