SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7adf06d8affca6c928a5f858213e7660558cfd741a5b3f0645b72ae1213bd43b' 
  AND token = 'pE85fWzL4cMCAi4iJW96uJ/UZHjCfVdNwKCGJI1USfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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