SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c0a119c5f45a2f16fa0466923df97521f14cf924214170df7e03326299135b7' 
  AND token = 'AEXq8Q7KOsDoIqFFAzJCAl/9OXgPiDNN9wgbMSH6Zz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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