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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '836e80c27947ee26f67bffc67c47e11fd56c6799835f727ea13cf52a33f1128a' 
  AND token = 'SlziTvZ040rIkyGCTgFGA4y3JM/Zb7k2VP8ih+atYDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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