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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40f7bf5687ba1feff1dbe8db4a595b3ee6ed6313763a343b4548ccfbcb4803f1' 
  AND token = '/5iG95/S8iuMr715VZHKnDJef7ZOJW0L+WfVtmTafF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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