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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfcd40fdb84845c14b226184390fd648ee1f7add898bb518c523f62b1e8e300d' 
  AND token = 'QxQoUx5dCW81Mw0wnHnTEkitx7RV5xGuTVkJR8VsiLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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