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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c77e3acee79733445f645b8d449283f6df18e90f24d2549ec0661d770bbd36d1' 
  AND token = '9Yo388/LudCT4/1G3xFKKQhcs2zF6MXigas7mLclPUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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