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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e5b99a030ca2ae1e012614edbbccc5cd8d98282d55e8526942e7afaa9a0f1aa' 
  AND token = 'FsCnHvrIvhuUF16WVKb2Es15UvonAPdyEmzI9a7br5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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