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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99b8c233d6b888c908f66e18fee0a557b17e21c6c30ac9d60879d1bc23acbd8f' 
  AND token = 'Vns9zxKcNc7jy/W7lNak/Ao+E7+XQTUjYWnOascBMt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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