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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a3e7d88a24a8afb1fc46a75acc2a892a3abd464acc834dccc1306860f91b9b1' 
  AND token = 'KGZSagyxGVl/iHoACdXpCqBcdlOe++6kys81A9tJMQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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