SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf90b1edfa7bb8360332533a55650af16f4cede87d42c2c7a470a4209392ef8a' 
  AND token = 'Yj8Os7e8SGNYXgAJtK4X2yEB+ZyIgz14lV73T0U/SH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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