SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9da347a2586a8c5c439f6454b56ad3eb095139b30e47efaf3f98647c4cc6dee9' 
  AND token = 'Vh/h5tiH+YMX9JeWJ1wIxSMVBWbL3n61pF3TmjK/Tjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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