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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03cf62c66defe0c950e95de3627b935e8065c535bfb3018e66544493a7fe01a7' 
  AND token = 'ubt0+bbBcX0cvI8On2H3Xumz4KZ6wRNvjjenlMY2Sxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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