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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85ff5f7df9f2f8795b1759cb1cb0a578ae0e058d833a54ba428e5ca88a69c6bb' 
  AND token = 'JijD2ydwSkbHJe5viJQk/sgr7uiOlJveJ73UY42RNsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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