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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3027d7ea336158b9e58ff393678cbc84a7af5cdc85276ced6c9cbb6d11dddf34' 
  AND token = 'EdlyPnpVDZABv64nezdIQXcwbBpi6je3CSxhfIgxCiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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