SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebb97966647939df2ddcbce55e3fc4d419b3a434ca19a2fc4803aaff2e746406' 
  AND token = 'RIDQ1fDvSozO+mmp83kVntqJoir2mZJgAnx3hP6RKCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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