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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0561b625e1e87e67a6e4bd55a0580de2d6d5c7ac181a3219b1c41ba07b330ca3' 
  AND token = 'lZLfCIfXZcE/0rI8lINMMHVZaL/kDZMpFq6zrJ2mSKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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