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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84554b8ab82b41e362d0019680d743cb6a8c6dad27adf9a5b386128d6d7c267d' 
  AND token = 'dtC7O04V33agnQcKy1LlbM0HR5Tr+rG2ZsdrpfbE6Bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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