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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb8b47e5bfb71eaa0f68ea3f17d72d5be0a10e71fa3088cd31a8ee3070bf3fc4' 
  AND token = 'ipqtwGhtyE+47JIGa6pMs1RtgqzzV9H1FIQAxgJNN6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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