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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b596736c7430c77b064eec621bc3f402806ad4d55f91a15db7efa520938a5d8a' 
  AND token = 'X04ut0E0QM9ZOvK1fh6o6BNEf0nab7fVysIPJ3wSvqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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