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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdaef56004971383ad3be7c8eaefd325f6f9b004ce29a6da9ecac90988108879' 
  AND token = 'ozj++iAorMWAKNvqYLifUGE7LO7OUMuEA1ZyTZKdR/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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