SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39adaf9d8b21f2db0a3b4965205bbd5f78497e407e1e499e0c0ce39242107bdb' 
  AND token = 'fqPhuFpjBWRfLg7kSVAGgM9H+qkkBxQ8MSWVq1YVK5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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