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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ef1d2f39d9339db34ee807671c23eb4e76fef39e3c5c8fdd36ba171c4dafe46' 
  AND token = '5PXlkIMov9qoxClZMjGCLkC3MYWBfBuA+ZVRvS9cI2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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