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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad9ff5bf63f67977effeb2ae8c81a90848abae763f3607bc450f6ecd3f6f4793' 
  AND token = '8HijrwCAk5F8YlqI2c9mve1WKJnC9I17gmVf6tk+BrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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