SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f3d492777ffd5e192d090e544afc8fa6ec496be1832fbfb689de950df4c28ff' 
  AND token = 'BTkXJFoFJjIqCIhqs1dvznJnhEaGg0gPN9ZNag6jZp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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