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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11e4df43b8d1c85159fb2f609892a75bb3f23ae9d1b1b6ec086a34b9935f00d5' 
  AND token = 'gvyeh10kzTrnKGIixQLX7gagmwRPpZxIkiCLFrfNS88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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