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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34e34837db8c741233bfcebcd330b84da0364717946a4860b1135ad5a5a9e60c' 
  AND token = 'SNiiG9+xXHtI5CX2ftDWx2WCJKkUmbxJjflRMIaJJU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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