SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcd3ff01ca5eab035dff4eaf9c6b1e0785fed25628c1a7ab465a524f17b67080' 
  AND token = 'EoSOBukKLUEdHzBFgktVAtr6qveDwRTVFn/J+iY61AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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