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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc87009de9d0be609869d88d59fac12b6de27544c534cfecbc09d2b53e7480dd' 
  AND token = '3QXkarClKPoKzvKX7PNbVAvLC7NkM4110d1y4ohXKQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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