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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfdb7493ce2b25e37e673e864a1f3f4a6c74d8df7419d9daa22830945b002ff9' 
  AND token = 'Tgz1tIZ+87uC7hROUTUKVoOaa2P4yVT28lqxfd9hivU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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