SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0b927bb7eabb3ca66183ca14212817e2d34272a1e507118d369cc7a0565fcff' 
  AND token = 'VKB7MA/Ldy0oYD/eXUK/mNIHpvPh292RZCcVvVPPSBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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