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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb166e9a4274ad753f6b8211f083bd69d22272d0990aba2213eeaea1686ddaae' 
  AND token = 'bxOzNHfNIl5ACprzpl/DMZJrZskg9jC/GF/zADTOO1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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