SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edc55330e6bea0d637cc6a359a57b9c8cf80c434b2c9463b94c08f8031428cad' 
  AND token = 'ZCOBgUQrj/WYewQv0658vNhSzHPTGrxwXtC/i+KD7CM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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