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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10373670a42208517d6d6f808485e6c21bfd2448c60d3fd23a1436362d62441e' 
  AND token = 'oyFxAj+PzJg4MiaA4ItJU2gzl/wfmQekTgd4ouy7X04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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