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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '478fd33c4a0eb1e5b8b0f9652fe7ad4719a69969dd553845bf9a8b858cc7d5ab' 
  AND token = 'LPQnduzFWys/Tyn7XYStNhR/g34EhgX/ZtNtBxmRTfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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