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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6d96186fe54b8a32031473ddb8067e8c93fda692600f278185b9913ccfe00ad' 
  AND token = 'v7XqiYlk2+6uTPJ3ie16VI8wgnlZFFOx2w26B7icvfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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