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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69b00ed2d24ad3c1e0773e37f862ab248194bc4315ef300757085c658b5d98b2' 
  AND token = 'XtSuNCju7TgrNid3zPUaVdS911mY1qehHEAPT+f533Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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