SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f101c4539c84469984b745f19f7c56fd5f841dd84706207e8827d6ff5d2bc16d' 
  AND token = 'ary5FVTtOq2T2p//7s8xJgjMRzpPzZYFBoxQGMbbBDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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