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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c70cf4a9e89f35bf642b0179d9473684119fbe5f5646ba5a6ec360f58f32f3b' 
  AND token = 'a0V2hWQIWVR7mm7JyOY4yH7X/Hxsfrl7WbUzICMBnA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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