Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a304c28740042c13003372686182a2cfa3e8f3b64d94bcb2142cda7f5edbba43' 
  AND token = 'n1lZ0KKd+czof10yDFmSZ9XPfRsyF1pKYNXqD9wOr0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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