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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd16cc6b99b8524e6e4b6de8b3f16d976d2f5d43ef17cc9dd35ebbc7c38229223' 
  AND token = 'Bg5LZx01yxXeTka3QcfqNHtWaTNOp1fcnVkDhL/FsL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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