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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d7bd3dd5f69ad739e412d14465b3863d472ae61344269f4a2f058627d7305d8' 
  AND token = 'AQfZRfrqbzODVKmZD8n88R55pUQ8Ao3YqJLCy/y0m3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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