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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23df79f1fc9326ea91d21d1068469faac12678c2bcc8822b528369a052ecd94d' 
  AND token = 'nFNgmaZI34JPCvCQvhN/e/20N7IZ7Y60A9UxgqYrqu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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