SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df185e406fd549ddb8c8b8e6a2460197eadd21b81381c47b985782ae987810bf' 
  AND token = 'ysHuVGK45pvEH9o1am6IzFiFtV0XgBXKcqGSKqrGUPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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