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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff84077234830a56466348d522509c7cd3f7ce71c8b68eec05c6dec74af7f21d' 
  AND token = 'ab8G6hsjqhmqFM2o9RWP2oehzvmlGKgp2fIgSE+GpK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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