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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f04cbc22917df0ae762155f417d4e979c7ad6651d353ef63363fd23a7ad833c' 
  AND token = 'HPKFRFG6dMcs/zMRN+shEaC+GoBzaIB71ZVEO1sFVvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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