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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b06d5f5a4118b69bcea2c187f82681344e241564620ae87ffd29f1679228408b' 
  AND token = 'asAKh3zT//ajfVnr/Q1mIoAWn/umtPx2slRuM1ye8uI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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