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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acd5820cf45514d92559ba0e95beccbb6811b832c00f33d5146ac6c4e60a65b8' 
  AND token = 'm5ZNvKQhRtPHdKunV3U3f86kMDw2ACwGa00fuBGju+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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