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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '875ebd31a5b7c9711dd0c26ec7b84a3f80047a4b3b283b2b528beceb11798086' 
  AND token = 'KhOCHlHDJ9KvTs289ptlOOWRk9BIhyB+ww+C8ChkmJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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