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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8692d8eea5f3f04b39e9ca80bb208cc1d8439b0d21df9567c2532f36b546e6e8' 
  AND token = '8q/MYf/XAVd37uIobiGNmWWcjF6O0X4kZ5UVKru2MYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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