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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14ef365c73ec87cbcb739255357808c83a4516f480366b526217b89aff2e2b05' 
  AND token = '7CHWdMBAuZoUTFrh2WbKOeV6jVcCcLaETtAcAAQ4Rc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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