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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a188c9ca0ce1e513f6027baf304ab9745d41cc9ec21928c6c821307a8f099b44' 
  AND token = 'sAUuX9hrABTwNbuF8sr4crMICOBG9XaeqDf+Usjguvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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