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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e0e8e06b9469a6b2ad7fa0601de0bc860f9f46f8a2b3cc4a59ef824b834dff0' 
  AND token = 'akVcA2sqxJHtwvDb2kdFxBayHYUa4G96TYWXAhvISkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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