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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd512867c20c464b7e35097caa18860295882c583d9703ec29f26babea7c0ee8c' 
  AND token = 'Oph5D/LmEvxT0ujvzSj6ZtbLDjRuvP38qKE/kuKh768=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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