SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bc698b640c984e9072ed24d9af8b4cc6dc614ab27f3e52f720f4237b53737a1' 
  AND token = 'w1gNlqGWw1QLBrI0Qc6Px18TFhzQHzvD7/Ay1WLU6bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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