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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6138f43cb95f1d03ae3346fe7a7b7c3c69a077c4393e5e76bdf98c6e386c5d5b' 
  AND token = '/qrxUwK6YaBYO95I1O8NreWDUpgWrYRulw2jfUigvxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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