SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f416bc13358559728c2314879f1a123cde7f9d92bbe3f0c5b124dbfa311a8186' 
  AND token = 'Iw5KaYuy8XF6ErQBXzGepdgqgNWp0kyPWZYSTvVkITc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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