SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48827ae60ae5b3fc6bd78b294e7f1b589be5a16c34cdfde3380fe644cf94479e' 
  AND token = 'MK2VGXwd+1P9gu/fBRZCoMNeuq1U5vnhz6a7uZa4C/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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