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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e96449b8dcf76b1fe904eb571a7eb9394718bd0eaf6a2e1b89338100aefbc300' 
  AND token = 'IycUZZF2Pi++9znK6SrbiBi5KRnNYzFUrLk5nP/Ohk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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