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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3cc428d175e4f2b17aa4b1e8b3359f1196b58e3c7f572eac4965a7d595f8c27' 
  AND token = '9KPxeAQWAZ33ofFmEkJiypX3sScfZ6fuloxOe43iqYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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