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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d022cbe8754569f3c033733364400a5544b74592920bce7d712dde49851dc42' 
  AND token = 'pthP9bessnvKvY3DT5fJSO766komLgLhp2Irz5QhW3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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