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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '817b725a7b1a9eae9c3d8ba0c8b49ffeb21a76aedac05ab4a04404c3640af802' 
  AND token = 'Mr3nENRSHd2DdyQdJXB2W6ftMDucov96PEOUBd3gX+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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