SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f17a5966b838c49f5e4500dab3eebdb8188943bd279500a62e731a17c3bc441' 
  AND token = 'gMk/xOmHQlPnSHmZ8dJRRPgUE0GfBBzJYO+arY4rgKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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