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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df09ab42ed9552a5a303a72a82db7b33e33061966ee679aaf1bfae2eeeb5f2f7' 
  AND token = '91K+mHDUKV8ewq0BTbCCA80jfCwuN992gn63fKfeEoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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