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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '822f94481ff46b823d80ab7ce8f0be9a79b51feb463ccae9cbad5b34da9b8ff9' 
  AND token = '8J/Evi258XUnk/pEKTUxuXoIk77g5XZ0kO8gHZ98fUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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