SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '412222119ad0eb0868435c9ceb5b9f9f14fb3693c16137a58148484db36f59cd' 
  AND token = 'NnD7Wxqgy+miyqCGh6WzNsB+sSlNoDXZNDhkkOJsZ6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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