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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dff5b83d5f79e3f0be6e79a14d8a5300825b57bde90dff604c861283ef34664' 
  AND token = 'aVTJdxCxVjZElo9Mj880T/ZHBQT9oz6w0T+aJSFhbto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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