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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd28b86f7ee5f51041fa97e33a2de42a4e46f245a4e501b304a15e1185cabfc4d' 
  AND token = 'jLlU7RJ2tIyZwfLKS5RxsAHUAXnBBQneI5hDMnUPC1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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