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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d5d14fda36674937a4a32f0b40de45d41098c0f792cd3234f9b9f3e2bf51e96' 
  AND token = '2rU/fVO82DZJVV5VMN88XMFop4ASH9O/MGz9Lip4euI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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