SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ff45d3b5a17b1169f452cfb4de53954f0f62dbae8fb85492a4a677618aa4a6e' 
  AND token = 'X17wOyUkVUfLmG7LABDhl8oJl/YUDOTDhS+SP9evTi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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