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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96c5c5bca2788b6bce040e3a5a67e75f6368ab001af8614ac317c7fae4e026e8' 
  AND token = 'MIY9eFNfWvxHp8TIzusjPZY+bTypLFWx3cdIbYyXeDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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