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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd079bb06396fc933ec44d9ebaf8f3611a3db553a5694ef1f87f5fdc9c82b656' 
  AND token = 'QnqFIx3IeiYMD4eRNqLN02PgQYVVeHixQOOvD0jF75g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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