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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd72dd74cd1e4ed09ac58cc9fd7667e23c41a83b4ff08f667b9abfcaafcd87ae' 
  AND token = '4zY8DSH7VXxUfQ8P1VSdyFJ1ngM/hNJ5b0PLjh7cV0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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