SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '406b5c2cd83123a23c69478d9b0aca7dac5bfa554ae876439684ac42b93ff832' 
  AND token = 'obhnPqj6UCoT7TRlUXW6mViR2GyLBGIQzNmVELqUzMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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