SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '928e033ce28db6aa6d4179db0c9a2fb3e418d583ac3548f67cf9a47f7d5963e9' 
  AND token = 'rjMjdB1VTrFVhggT6lAJ3FHF4eZwZzs2jzmx46ScW7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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