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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d85cdfbd9239bb4af0ce737758ab1acb1050c1363c13402e91c65fd5988cf30' 
  AND token = 'XU3rGzxnHPoHkuX1bEuyZB0qL7z/buJIn4LybFs4Hhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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