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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fa7dd28957424996b7b0de54c133f46c17f9937eb161825bf50bd564db3692d' 
  AND token = 'ci6OZQbxSQwCD1nQpoha5zxO8JpUcxeQH7iZmmXkoJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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