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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddb7d447eb034c318eac6f6db8f381918cda5f8e55b6733010a344d1ba4da793' 
  AND token = 'Xk0Dwx0kWmMjJIgflbnkIuv7TOiOizGyHolu3FM/SvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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