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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17e12eb8e14f7d5032b9b7440ec7d3b2a5f4c4ac00025e0add4363b919208313' 
  AND token = 'oACqXBysGIHCC6TuXJJ4KPKfT+VUMi77UOox4wxy11E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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