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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb2873539c13a56caf669a215ec74816b7b8a3ceb18b3f790ad86d70f2580f5b' 
  AND token = 'F2WsTPIZSjiK687UAeDrLWAiDSkv5SsYpdvhEoa4dBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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