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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f14f5b4741f92a9da3ed6484f8229b6d3004c1f3d24b767dd043e3dbacf3bb3' 
  AND token = '5rY4sJ9RQGUigLCcxRv350RokFI9mdWC4irDliI+QTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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