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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d682ef1860f10155cab5b82af5a247776ee01e848b23e87bcf8a70963abd10c' 
  AND token = 'XdbfcWzskpzfjLOMm6zpHp9b7OCxt5LTEFpMyXdIF60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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