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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ff8dd83c0b995dc92f0ef029b8747bce263a05d150be4c7bd7120b6ee1f42b0' 
  AND token = 'IdgWA5hvLloymuLO/B9TFivnAbdwV47z6vllmFblU+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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