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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2924d753cf92200eb7c7dd3ed41f8914b307328238adfbd75e5f12fec44a0950' 
  AND token = '3plvQhYtEgMV+7a3C3xS2KeK1/kyR5Hn6zMYrTbTe9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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